recovery.

GitHub issue: [#406](https://github.com/ruby-amqp/bunny/pull/406)

Contributed by Bill Ruddock.

GitHub issue: [#383](https://github.com/ruby-amqp/bunny/issues/383).

Contributed by Jeremy Heiler.

Since transport is replaced by a recovering connection
anyway, and this produces confusing errors up the stack.

GitHub issue: [#359](https://github.com/ruby-amqp/bunny/issues/359)

Contributed by Donal McBreen.

Client-Provided Session `:properties` will now be merged with defaults
instead of replacing them. This makes it much more convenient to
override a single key.

`RABBITMQ_URL` no longer will be used if any other
connection options are provided. This makes it possible
to use `RABBITMQ_URL` for some connections and options
for others in a single OS process.

GitHub issue: [#403](https://github.com/ruby-amqp/bunny/pull/403)

Contributed by Jimmy Petersen.